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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57025a130821e279f113330e715914b783d28af9db8f08ab7575779c1f62192' 
  AND token = 'KxpUpAHaFthqtXly4lh8/EDNbjK2iFDVhLwH561bUXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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