SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a505788c51fcf73c2b81265140e03ffffaa99e36c4ab41acd965b50f7a10fc' 
  AND token = 'phUuSLi5CfCZshK3JOiJLNIG6vu/q55zXH+Gz9PsTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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