SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f719d185d2e2ecb733488e0c0444790fb26be51396630cd179f336cb27578711' 
  AND token = 'xww9bUa6N5tfqZLsvTvU2qqhIzNnsfw+rU/WB0Q/ZBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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