SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67044470326bed07aff6e4f45b4e2b981697fd07a313233b67a3b1d3048604fe' 
  AND token = 'h8NCYfA+2sUxLFhMoYMqKZv+sd9xmpX5jh3zP++e+II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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