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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765e9e0bc526e88c96838bbbef3b0334e402cf5c68a5052c50920a110d25ab7c' 
  AND token = 'OfsL6280UolcXBYDQ7TsI8RU2h3Jqxyd+Bcl9V94SXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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