SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd0784477214239503599a25f74cd26290c64818c01796af03b5eb50c57322c' 
  AND token = 'ZpM/y8V4kLKF+wHCtmCxQGvVpCrxYdqA7v/u1vrcoDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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