SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff452c4df3f8276f58631906f752386e0e62dcbb49eb9f8b707a541ba5b5216' 
  AND token = 'kcOwjEOwfqyqAgdc3pLYZg0+zMSGJGKeUZtNjjrZRFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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