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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a91b2411c5c440240911dd61f2446ac0fad9063bb6755331fc12d2a9ac5a46' 
  AND token = 'GAsjsep+rpn87/WMvz6I6yhnbHhSTjA/yeX0oBQibtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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