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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a76b3393dce889a7c21a25cedab60444cf7f1bb985201884226f8fe736ec465' 
  AND token = '4MxUL7gkRSvE8FanIHN3h3NJ8IXaVbdFCUnYAHuEP5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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