SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11009f25b6bbf84ee0da3c01d74cf6a58d2e278628f0274a3442b7c6cb8c997a' 
  AND token = 'XJKQtgTrgGo3ULmLidyTfZJSSCswov9kW7dy/sw/CZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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