SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43128928488c172eb4de2acb4e84f8f5a63746803cedeb73a461056b7860cdc' 
  AND token = 'jWU6F6kI5KHEfDA9Wn8guM4JCQ5qHZQxLOVKPYGXHTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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