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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc35f77f3b028e07b67475a8e239dab392c6d53d6fd9e003af7881cf39d8a5df' 
  AND token = 'cPYv1bdzw1OmubZ/qtmQFeMlz7BmK3r6Kn/hc56jd1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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