SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2beed9c771993f0d5cc22cb3f996f8847bd88cdb6e1053778175b633351f93d9' 
  AND token = 'lGOJhBZHYd+v381qkC+OiCACpADa0VtWaZLwNHPSxNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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