SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbcbe892ee347851a8e5dd9ad60a415a790e5bc621fc2df985177e107e074b4' 
  AND token = 'WdTmPujhKYJnsBdGgeA0idyG9gvxBxx3Sp2U3B/VuKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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