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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d79ad1204f063adace8c575966800362e52a14d7ac759ea98b043ce349a586' 
  AND token = 'Ti9lZx8quKUExaT+FJE3qnFZ2J5uuO9gIUkhm7wjoHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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