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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b63b6607ec155cc9db1c5e052d90a9a5362d212ffc72ca6a5dee968faf83a2' 
  AND token = 'tCULgZyIq1+AHvNQzK/bcW0uhG9IJODNKzyk5fYrHto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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