SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9e3799c3788f34d1105d1b5ca637e0a707a528b5a56f6327f28fc82e4588d0' 
  AND token = '1XI5zbh94QjGOB2VpuEIpbc6w+EJfIwvig182nwhSD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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