SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7337057ff19c865f009a73929b9b2b87b8c110242fe5564b50c09b36bf252d' 
  AND token = 'UWUeu+AmIw88uYT6JPF5Jmwvi3hyFyyJyBK11WOOnG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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