SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695fffde3c24139f0a1198e8a7072c5b40a6993b1a692f0cd710a7008d5c5316' 
  AND token = 'kwVPv9nqJ/Hzje5Zq0x/J0NJEl4zQr1wnBhMa7SX4DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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