SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c219a9f94ee08ff6d7c3a18a146ba51c1c97d8870f85ae99e3d7322fef9384ef' 
  AND token = '4BhQqgDBO2R/D7sARfIvCDthj4ZQVYT+bDHAd7CQQnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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