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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fa6f032af689c49be0688f51dee5430854208e78883596fd842baa1ce88e1f' 
  AND token = 'MF+bett8NgfuiwpBh/s8kbYf5f52hC8rOopolX6yJMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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