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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd363ec71206e5134b795641761c8684aeac4721e7e71d20b034ed75251dd54bb' 
  AND token = 'YVuelMbHpl0ndQj9FIZWqtvnpRQoHxZ8ucwRaXk7cD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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