SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe06682ca36081da22a1ba476f93d2a7370fdf7a222ea1d6cca28dd89a6327f' 
  AND token = 'tBLtpJGRpDm9LZQGxd9/Hhg+/wkxtJywjlW1RQ5EFp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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