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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93946d4c0a8d3a84357ab683fcee9dc2db1d51a0f08c4a2f78efccf8ddf6a57f' 
  AND token = 'M29r5PVrlqLwodMWbs/X8JK3COiKQcjtKTvl7nKLBHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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