SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abac9f88dfca862c0ff049b4187475f710af3e24cb8199d4ac72b72d81a716c9' 
  AND token = 'pV9Gu6Y8KTtZ2Px+ZlRBxFWxBAdqDvz3a9d9Nw7bJgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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