SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0778fcdb14c33b8869699d89fdf5d190c93f74a9696670b4d323cd1b15d8902c' 
  AND token = '5hQrYi6/OUKgbcXFEndF/yvoBcYhTL8q08+07Z3z+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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