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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602c622500cac637131f813d2ceabc556eb375bc7ef2e5db358a6692101a8dfc' 
  AND token = 'CnMd8wyDH4biNT5PMsSlQQajsPNlq8BMqDudrZVjE7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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