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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63bb827b799883ce32c1335ee9d341064daaa7ec3f74c46852952f23bae7804' 
  AND token = 'cEDVab4zP/LIuVRMaQL/n6JW5fqA5ccCeeGo2TT49aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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