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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cc4c1cbc50ca7dc72fb09e0af7829937665974fe67fd5847db38ae227c5c3f' 
  AND token = 'WxSgskenm02hoYcPI+CftD5ww9py1HYHUJtVmqdDUoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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