Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc36b5d405f4b0cc7e170597442fbadf0de47679337272d136511e0b7d1f35f' 
  AND token = 'QpYfjfiKjHi10+Y3/pNIok0iM/frvTOFWHvZNcZb6wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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