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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7461e7e7337182ab281838acdb33ce1ab02a56646a3038545584b43dfddb3c8e' 
  AND token = 'wKnIFT+tppj7noA/84fj2rN+yoHljj5WNTqBXlqKpYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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