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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c93bf911f8f129edda1a8d6d0915eea7a671558c2a73576b3629366bca878e2' 
  AND token = 'lLeFcEeACcC7+RTVxd680bWrxphQgN3Tk5n2MfjL4OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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