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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2470920fe75dc1cc7fdfd90f3bfc9daf5f17893672532d93f133145b9a7b6664' 
  AND token = 'o9MN0O7J5MshB5bXQTXqb4yhMus31Xf+RiSk6Rlzzoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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