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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aeb008347f455745468dbf17494572d2f4e690424073b0aadd3ebb1479e2df7' 
  AND token = '3QTqMqJBeurRlxULKpAT3v7BBdRrms2IztSdmuIT4lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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