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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11120088686ba5412115fbaed1c8b88b75201155b9d86762f006ea6e099e570' 
  AND token = 'JUID3FfXSkqqw7lUrWmvHOkZTC9sHj7qV5e0PxXd02M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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