SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13f45ff66f8b2468293513e3e43a64868ac32b159d8c27c1deafd9b6f2e71da' 
  AND token = '8XuW+h7BOaBRURmw5Tuqw4P+rSHvgBo6zxEx++e0qjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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