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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624578e530f0c9532fa0562a68be26d6962eef5fd40999835efb76b921a71976' 
  AND token = 'EESkf/3AIxpE4J9JOuadFUUrGMor6OHw6leqU2oaRuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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