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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd671f7594cfe48ea10db2a4eee643b8ea28113f66c701cba04908711ebe94eb4' 
  AND token = 'RJNtpmDu5Fk83m2p9PmbIZmhtv5sKmMa8t5JpFRTU6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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