SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07d9d970165b7af5c6536394a2deb63f9ba3931264eb488de695f58ca1c4e99' 
  AND token = 'SfVZ7PG/SDWOHVM20+CqGE1OtHLmUvYAXBHC1fI9NZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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