Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacebe76306d20d82674f54f93c4883ea5fb43adafaefa4ae0b26f478a3532c1' 
  AND token = 'fTlhJCpNEjBsbkitOU2rkJjfmwJ1WVa68mgUr3h3qGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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