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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78e2c8e4f66f9c567a5958dd35a51f7b6e32370275f6d6415b387183159e4ba' 
  AND token = 'NnjSxnvvj6I7KFRUiZ0KYKE4N9TsTU968t332PrrxzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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