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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c466d3bb4ab413f8b1eb813cc87a4e457598d1d3f4c56ef48cfa239e305ceb25' 
  AND token = '9sC1SDNDjaxsAIEkmhJhhZ9WXwYR9s1h5hwF8HC4OkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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