SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65992a7407dd55f0d618ba79281ffc05811db63a7912e905e24059c67332236e' 
  AND token = 'wDHJbmuDNzuIGzDGUM4FC1BQ3PNdQlOwtshretKuqBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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