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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc8f26057ddfbf8b29e9c73e97ee94bee79d0a3c208a9155ef8f55d4db54603' 
  AND token = '5XSp2hZSp1/uBHQiGDStq0e55iQtaA7izLOL4QSrXys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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