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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680536b9e39998a11946b326b0511e1804474deae52728d310104f3231a9927f' 
  AND token = '180MJWI3CLuKJmkjwO5EUTZ0fHY3fEK5NJZxehI9q0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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