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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799cf502169a9d11c576746b6db9b927fd6a68f985bccb8c3d18799c848552e1' 
  AND token = 'CQjrNIAlQd6beKEl8LuZWmC7xnZSwAhs8fnjO2QIxgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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