SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c63399322f8ce371623df8960180d60d236a5e38f1dd4fbeb2f6fcdf6485895' 
  AND token = 'pKTe9EQB/YCp+9wmRKmtUWg1mowxL789hq7YWIJvWsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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