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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b5ab70a3e8247c144ef9d183481836a1ecf35dd02977b3d4d7c2aa5ffadc3e' 
  AND token = 'Q9dwbiuE5FTJ9k8G0yQ35pOuMxo9PJjgVYqoUYG4sKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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