Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed75437e1cde6517bd9ef70058fae6ff22b59dfe9e6303416581294ea482a50' 
  AND token = 'ctIllQRhZ6hiLKjnXDzc8msp7EoTBefOcJyjcMC+iDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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