SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a634a066b5e35998d10c5ca60a19a2899d1ce2b41bdf26441f146a73a8485d' 
  AND token = 'Q7tAjhUg5H6HSTvZKtRg5o36RLOXRJp/lNqdkz4nbYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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