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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd007f938a184189c2f7117769711ceea5cfd8b89b3500b82d40d2922f999f765' 
  AND token = '2OTxaL5iNHbcjKEvV1RaRUxDo6TyVBteuT/nl5YfmG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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