SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60448d5aa3c9441c1b36e806794809492ef30a27bf26bff788003bb89f510d09' 
  AND token = 'ipUmHvDnjKlplGB+YFbxi/q0LtUVmkMEwlInyz12jKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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