SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d02e39ea0bb05cf029bb30edf07441c8d9c7b78d27149b93ae8d396af1a56ac' 
  AND token = '/6Fj9DCsLLqDiQTfaYvol+Fe5X5nVJZ9gujdW7rWz9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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