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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9317755451de1329033229f9e7c80bd0d3220ff8e7c915f3e153c0243fc0a88' 
  AND token = 'aut622eaNq0NGS3pmrv/4LmKzf1a++nd89deAVxla/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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