SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4329430b474d11f167993b315fb46fe01f24477a7b4a19dab8812765cba641e' 
  AND token = '7EtPKGBMN5gU4kwG5DG3xHmuUKZl5K/YQlGjr3Fzx7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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