SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169e32c91c41c0517328a09c681b2f8a8e8fcb5dcb9a77980269ca4f3f291a85' 
  AND token = '2v1+1pg7Y6vhV2DSG7b+GdwqVZulmCOeW9yNxrKS2tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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