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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d57fd5aaa143b5b3ab97a92e4d4d14d287d115d93cee43857a79a04257d7fea' 
  AND token = 'fT4lJhJHHgwxokrlj2rOnbm014G9s04JJc2pHwMhBuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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