SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1189d1b81e55109801e1e2af4ff12da6aaf5ea7207897a4ad5a03754cb59d63' 
  AND token = 'QpxezCnF+uKxJB2GwHfNQS/FpJdIHrDkYYzWS6bx5eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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