SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c34277794faeeb330803b361804d5716633865fa3c952112d14bfba7bfee2e' 
  AND token = '0/qBFmoVPICteXAAhgt5Uu79bzgZpAJqAYQCFr/S5ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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