SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73e8df2f76affbf257aba5d901bf783b581a898210dc842ece49751f1c79748' 
  AND token = 'GwPCLKs0hLxUshhFexuXcJ6Y7A43e6YJlmm5b+pgnHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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