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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0cfd1718cf4df4869453bc2765f9ed82e066977821a391c11d5049264997b9' 
  AND token = 'wy781GoACNva68A1nsLwRF7mHL0QOgpPON0Gfy1ioF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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