SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1976e5b26a7176c05ba060d0632f25337e318d7e94f081f9ff86b353268c4e79' 
  AND token = '+0FShEzcLxcBzfG29I6C5VJWnirH4Qba7XqRYvHvTnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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