SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e02699f8af5816662f5ad827d1dd1b8ea52dfba623bef4250922ca7f574299' 
  AND token = 'sGtfjuOXA3weHNstV2WlughWvR3JO8v9zm5/AZ1h84Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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