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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63576e6e25a6dbecd4e768e9697a012cf8c68f46ac7f6a0238d681691d99c2b' 
  AND token = 'Wo1TDqofpNwg/CkqtRx5X0EBkEgmHch2b6hdbLPVSD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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