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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f142d2d6847f8bd66555bbdfb793510a8399b1a3bc772000c94a11f2babb47ba' 
  AND token = 'tiR62U7QF46lL3TllmhuaoJ89Xwz8Co2JNA3bQzwbgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}