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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4426e1bc10f36d94bf487a1bd313d6f8785eeda22099707c35fab4d3f4d00e5d' 
  AND token = 'XMBJy1WEMlaxA2NxQxQhsb9EJhzrUEsm+H8AY+DlrCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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