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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ce95ae537461e6506b0447a2e3ee524bbe8a170f61c555696274659c95ea06' 
  AND token = '1CPlqnl9djArfFdKFW53WqBlJD3nvGDfcUS6tg/7M9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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