SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d7c6ea47cf61c3fb2465a0d0ee72ca4c00fc51c3b9927f9482b9e9445d4ab5' 
  AND token = 'AwGXYO8JlZHJGMG6CdD80wNEuKTJFtYyWzjbPqJQLFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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