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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9b6927fdab174edd49705551bb21d3e30770696f967d3e65661ed14a062748' 
  AND token = '3hzXblDtiptTAeEp/QLktKQPmSFSvn7St8gGZGhEplI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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