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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fd26e16df913914efcb1af49f9b321f97d491a4a43c3cc0e2b40cfd65a76ae' 
  AND token = 'NmhkJ18XVLkx/REQlg56DDz1hcQs/YQeDqveM/j6saY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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