SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77690f56d4ba3b83838e5c1a486238ebde1cb52708ab0262b41525d709349fcc' 
  AND token = 'x9yE+xjKpoq1qQkMawi7hWJ6uEKS4FxL5cCoT5Vfvwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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